Lens drill



Jun e19, 1945. OQ 2,378,637

LENS DRILL Filed May 10, 1943 2 Sheets-Sheet l INVENTOR GEORGE w JACKSON BY %W% G. w. JACKSON June 19, 1945.

' LENS DRILL Filed May 10, 1943 '2 Sheets-Sheet 2 IN VENT OR GEORGE W (JACKSON BY X AT RNEV Patented June 19, 1945 to American Optical Company, Southbridge,

Mass.,-- a. voluntary association of Massachusetts E Application May 10, 1943; Seria'l No.'486,466

ZOlaims.

invention relates todrilling machines and has particular referenceto a simplified constructiOI'IOfdIiIL' One of the principalobjects of the invention is to provide asimple and inexpensive drill, par- 6 ticularly adaptablefor drilling glass articles such as lenses and having a self-contained power unit.

Another vobject of the invention is provide a drill of the above character having a self-contained power unit which, in addition to rotating the drill, has adrive connection with a broach for reaming out the drilled hole. I

Another objectis to provide a device ofthe above character wherebythe feedof the drill into the work orlens is imparted .by the gravital to movement of the self-contained power unit.

Another object is to provide means in a device of the above character for controlling thegravital movement of the self-contained power unit.

Other objects andadvantages of the invention will become apparent from thefollowing' descrip-' tion taken in' connection with the accompanying -drawings and it will be apparent that many changes may be made in thedetails'of construe-. tion and arrangement of parts 'hown and de scribed without departing from the spirit of the invention as expressed in the accompanying claims. I, therefore, do notwish to belimited to theexactdetails of constructionand arrangement ofparts showniand described as the preferred form only has beeng'iven by way of illustration. '1

Refe'rringto the drawings: I t v 1 Fig. 1 is a front elevational view of the device embodying the invention; j v

Fig. 2 is aside relevational view of the device illustrated in Fig. 1; and

Fig. 3 is a plan viewof said device.

The invention is directed particularly to the provision of an inexpensive drill adapted par- 0 ticularly for use in forming connection openings in ophthalmic lenses whereby the power for rotating the drill and for simultaneously rotating the broach commonly used in reaming out the drilled opening in the lens is in the form 4 of a self-contained unit embodying a relatively inexpensive motor in which the rotor spindle of the motor is used as the drill supporting spindle of the device. 4

Referring more articularly to the drawings wherein like characters of reference designate like parts throughout the several views'the device embodying-the invention comprises a base 4 having an upright 5 thereon in which is formed a slideway 6. A slide member I is supported by the slideway 6 for-vertical movement therein.- The slide member I has integrally formed therewith an end shield -8. The said end shield -8 is shaped to receive a motor 9 which is secured in place on the end shield 8 by means of an end plate I!) having a plurality of bolt-like members H for connecting said end plate [0 to the end shield 8 with the motor lying therebetw een. The said end shield 8 and end plate ID are provided with spaced bearings H and i2 through which the rotor shaft [3 of the motor extends. In this particular instance, the motor is of the shaded pole type which comprises a plurality of laminations surrounding the rotor l5 of the motor and 'which have a portion [6 lying within a field coil l'l. This motoris of a commonly known commercial type set forth herein only by way of illustration and as a means of obtaining an inexpensive source of power. The field coil ll, of

course, will be connected with a suitable source of electrical energy in the conventional manner. Adjacent the lower end of the rotor shaft I3 there is provided a chuck l8 for receiving the drill l9;

The drill I9 is of the conventional type employing' a diamond cutting tool 20. On the base 4, in substantial alignment with the drillpoint 20, there is provided a support or rest 2| having a shallowly tapered end 22 on which the lens 23 to be drilled is adapted to be rested. The position of the opening to be drilled in the lens inwardly of the edge of said lens is controlled by an adjustable stop member 24 threadedly connected with the lower portion of the upright 5 1 by means of a threaded stem 25. The stop mem- 'ber '24 is provided with a graduated disc 26 adapted to register with a suitable indicator '21 for determining the extent or position of adjustment of the stopmember 24.-

The lower portion of the upright 5 is provided with spaced bearings 28 and 29 adapted to rotatably support a shaft 30. The shaft 30 has a cam plate 3| secured thereto which is adapted to engage a stop screw 32. The stop screw 32 is threadedly connected at 33 with the slide member 1 whereby the position of said stop screw relative to the slideway may be altered. The cam plate 3| has an eccentric contour 34 which progresses outwardly relative to the center of the shaft 30 to a stop face 35. The stop face 35 is provided with a stop shoulder 36 which is adapted to engage the side of the stop screw to limit movement of the cam 3| in said direction. The cam 3| is rotated by means of a hand wheel 31 attached to the outer end of the shaft 30. The cam is secured to the shaft 30 by means of a set screw or the like 38. When the lens 23 is in proper position on the support 2| the drill 2D is lowered toward the lens by rotating the hand wheel 3! in the direction indicated by the arrow 35'. This causes the end of the stop screw engaging the edge of the cam 3| to ride downwardly on the cam surface 34 and simultaneously causes the drill to be lowered under the action of the gravital weight of the motor into the lens. This movement is continued until the low point 40 of the cam is reached where upon the stop surface 4! on the side of the cam will engage the inner surface of the base and limit further travel of the cam 3| in this direction. It is to be understood that the effective stroke of the cam is such that the drill 20 starting from its initial raised position will travel only an amount sufficient to slightly pass the center of the thickness of the lens whereupon the drill is raised by rotation of the cam in a direction opposite to the rotation indicated by the arrow 39 until the end of the stop screw engages the flat35. Thefiat 35 will cause the motor and drill to be held in its uppermost position of adjustment. The position of the lens 231s then'reversed with respect to the drill and with the partially formed opening engaging the point of the support 2| for centering and the drill is then again lowered into the lens. The rotor shaft i3 is provided adjacent the upper end there-f of with a bevelled gear 42 in meshed relation with a bevel gear 43. The gear 43 is rotatably' supported by a bearing 44 carried by anupright 45 formed on the end plate [0. The hub of the bevel gear 43 is adapted to support a broach46. the shaft I3 is rotated the gears 42 and 43 will impart a rotary movement to the broach 46. The said broach 46 is of the ordinary standard commercial type and is adapted to be usedas reamer means for cleaning out the opening formed by the drill 20.

Although a motor of the shaded pole type is described above, it is to be understood that any suitable commercial motor or parts thereof may be used. The shaded pole type of motor is;pref-' erable because it is one of the less expensive commercial types and is physically small and light in weight and has sufl'icient driving power to ob tain the results desired.

From the foregoing description it will be seen that simple, efficient and economical means have been provided for accomplishing all of the objects and advantages of the invention.

Having. described my invention, I claim:

- 1. In a device of the character described the combination of a base having spaced .upright slideways thereon, a shaft rotatably supported by said base with its longitudinal axis extending in a direction transversely of the slideways, a cam member on said shaft intermediate the slideways substantial alignment with the longitudinal axis of the rotor, and adjustable means carried by the base adjacent the work support for gauging the position atwhich'the work is to be supported for engagement by the drill, said cam member being so formed that the motor, housing and drill memher will move as a unit under the action of gravity, toward the base, through rotation of said cam member in one direction and having a flattened portion for engaging the end of the screw member to retain themotor, housing and drill member in a raised position through rotation of said member in the opposite direction.

2. In a device of the character described the combination of a base having spaced upright slideways thereon, a shaft rotatably supported by said base with its longitudinal axis extending in a direction transversely of the slideways, a cam member on said shaft intermediate the slideways and hand engagement means adjacent one end of said shaft exteriorly of the base, a motor encased within a housing having a portion slidably supported in the slideways for movement as a unit toward and away from the base, said housing having an adjustable screw member extending in the direction of the slideways intermediate said slideways and having an engagement end for engaging the cam, said motor having a rotor with a portion shaped to detachably receive a drill member, a work support carried by the base in substantial alignment with the longitudinal axis of the rotor, and adjustable means carried by the base adjacent the work support for gauging the position at which the work is to be supported for engagement by the drill, said cam member being so formed that the motor, housing and drill member will move as a unit under the action of gravity, toward the base, through rotation of said cam member in one direction and having a flattened portion for engaging the'end of the screw member to retain the motor, housing and drill member in a raised position through rotation of said cam member in the opposite direction, said cam member also having a stop portion for engaging the end of the screw member during said last named movement for limiting the movement of said cam member.

GEORGE W. JACKSON. 

